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Philadelphia Water Department
Lower Dublin township in 1848
Map of the County of Philadelphia from Actual Survey, 1843
Outline Map of the County and City of Philadelphia and Vicinity, 1883
Electric Pump Installations at Lardner’s Point Pumping Station
Henry Disston & Sons Keystone Saw Works
Pennypack Sewage Treatment Works, 1914
State Road triple pipeline construction, 1904
Keystone Saw Works